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History of the Earth

Page history last edited by PBworks 16 years, 1 month ago

It is theorized that the age of the earth is about 4.6 billion years old, formed at about the same time as the rest of our solar system. It was composed of hydrogen and helium produced in the Big Bang, as well as heavier elements ejected by supernovas.

 

Geologic Time Scale

 

Eon- largest time division divided into..

    Era- which is divided into..

       Period-which is divided into

          Epoch

 

Life may have began 3 billions years ago, and the earth is 4.5 billion years old.  But an "explosion" of life only began 570 million years ago.

Each of these time divisions are marked with a distinct change in the fossil record >> A Mass Distinction.

 

Evolution of the earth has indeed been affected by the periodic mass distinctions. 

Comments (1)

Anonymous said

at 10:35 pm on Dec 4, 2007

Careful with composition. The Earth isn't all hydrogen and helium so where did the heavier elements come from?

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